Home | History | Annotate | Download | only in medialog 
      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ANDROID_MEDIA_LOG_SERVICE_H
     18 #define ANDROID_MEDIA_LOG_SERVICE_H
     19 
     20 #include <binder/BinderService.h>
     21 #include <media/IMediaLogService.h>
     22 #include <media/nbaio/NBLog.h>
     23 
     24 namespace android {
     25 
     26 class MediaLogService : public BinderService<MediaLogService>, public BnMediaLogService
     27 {
     28     friend class BinderService<MediaLogService>;    // for MediaLogService()
     29 public:
     30     MediaLogService() : BnMediaLogService() { }
     31     virtual ~MediaLogService() { }
     32     virtual void onFirstRef() { }
     33 
     34     static const char*  getServiceName() { return "media.log"; }
     35 
     36     static const size_t kMinSize = 0x100;
     37     static const size_t kMaxSize = 0x10000;
     38     virtual void        registerWriter(const sp<IMemory>& shared, size_t size, const char *name);
     39     virtual void        unregisterWriter(const sp<IMemory>& shared);
     40 
     41     virtual status_t    dump(int fd, const Vector<String16>& args);
     42     virtual status_t    onTransact(uint32_t code, const Parcel& data, Parcel* reply,
     43                                 uint32_t flags);
     44 
     45 private:
     46 
     47     // Internal dump
     48     static const int kDumpLockRetries = 50;
     49     static const int kDumpLockSleepUs = 20000;
     50     static bool dumpTryLock(Mutex& mutex);
     51 
     52     Mutex               mLock;
     53     class NamedReader {
     54     public:
     55         NamedReader() : mReader(0) { mName[0] = '\0'; } // for Vector
     56         NamedReader(const sp<NBLog::Reader>& reader, const char *name) : mReader(reader)
     57             { strlcpy(mName, name, sizeof(mName)); }
     58         ~NamedReader() { }
     59         const sp<NBLog::Reader>&  reader() const { return mReader; }
     60         const char*               name() const { return mName; }
     61     private:
     62         sp<NBLog::Reader>   mReader;
     63         static const size_t kMaxName = 32;
     64         char                mName[kMaxName];
     65     };
     66     Vector<NamedReader> mNamedReaders;
     67 };
     68 
     69 }   // namespace android
     70 
     71 #endif  // ANDROID_MEDIA_LOG_SERVICE_H
     72